Improvement in hasp



I. FISHER.

RASP.

IIEIIIII III-- III- III-- ISAAC FISHER. OF ST. LOUIS, MISSOURI.

Letters Patent No. 76,618 dated April 14. 1868.

IMPROVEMENT IN BASI.

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Be it known that I, ISAAC FISHER, of St. Louis, in the county of St. Louis, and State of. Missouri, have made certain new and useful Improvements in Ensps; and I do hereby declare that the following is a full and clear description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon.

The object of this invention is to construct a rasp, used for working wood, metal, stone, or anyother material, in such a manner that when dulled, or worn, it may easilybe sharpened and reset in as good and perfect a manner. as when new. The same construction that permits the introduction of this valuable improvement in the rasp, also renders it an easy matter to free the cavities of the raspof chips and dirt while it is in use.

To enable those skilled in't'he art to make and use my improved rasp, I will proceed to describe its construction and operation.-

Figure 1 of 'the drawings is a side elevation of one of the improved rasps.

Figure 2 is a plan of the same.

Figures 3, 4, and ,5, cxhibit end elevationsor transverse sections of the improved rasp.

Figure 6 exhibits a diagonal arrangement of the teeth ofithe rnsp. I

- Figures 7, 8, and 9, aredetail sections, showing the construction.

Figure 10 exhibits two views of a flat connecting-bolt.

Figure 11 is a detail section, showing construction.

Figures 12 and 13.cxhibit variations in the form or section of the rest).

Figure 14 shows one of the round connecting-bolts.

The rasp consists (if a number of thin plates of steel, a, having-serrations in one or'both of their edges like saw-teeth, and placed side by side, and held in position by meansof the screw-holts a. Every alternate oneof theseplvtes has a slot about twice'the length of the widthoi'the said: connecting-bolts, forthe passage thereof, and every other alternate plate has a hole just the neat size of the said bolts. By means of this arrangement of the said plates and their connecting bolts, when the screws of the bolts are slightly released, if the rasp be gently pounded on one of its ends, the pieces having the larger holes for-the bolts will slide down between the others until they are stopped by the said bolts, when the serrations of the movable pieces will be stopped midway between those of the fixed pieces, thus causing the serrations of the entire face of the instrument to present a rusp-like surface, as is clearly shown in fig. 2. When the retaining-screws are loosened, and the instrument is pounded on the opposite end from what it was before, the movable plates will slide back, so as to bring the serrations in parallel transverse rows, and in this position the screws may be tightened, and the teeth 'of the plates resharpened, by filing, like a saw. The arrangement of the alternate'plates, with reference to the holes and slots for the screw-bolts, is clearly shown in figs. 7, S, 9, and 11.

These rasps may be made with the interior plates wider than the exterior ones, so as to produce a rasp, when all the plates are united, having one flat and one curved face, as in fig. 3, or one flat and one salient rectangular side, as in fig. 4, or semicircular, fiat, and acute sides, as in figs. 5 and 13.

In this manner the rasp may be so constructed as to be adapted to any mechanical purpose whatever. If the serrations be cut diagonally across the face, as is shown in fig. 6, it will be necessary to separate the plates when they are to be sharpened, and place those having the teeth ranged in one direction together in one set, for filing, and those havingthe teeth ranged in the other direction in another set, and then, after sharpening, the plates may be replaced in their proper order, and secured by the bolts us before. The bolts 64 may be made fiat, as in 10, or round, as in fig. 14, the advantage of the flat ones being that they will occupy a more contracted position in the direction of thewear upon thehlades, and hence make the rasp longer-lived, and more economical.

A. handle, A, may be fixed to the rasp by allowing some of the interior blades to extend far enough back 7 to receive it. The rasp may be equally well used, however, without any handle.

Haring described my invention. what I claim is- A rasp, formed f thin blades of steel, a, having one or both oftheir edges serrated, and held .togther by means of screw-bolts, a, substantially as herein shown sud described.

I also claim the arrangement of the plates a, whem-thsir alternate numbers are constructed; so as to slide on the connecting-bolts a a distance sufficient to place thefserrations in trahsverse rows for the purpose of sharpening, as described and st forth.

7 ISAAC FISHER. Witnesses M. RANDOLPH, 580. W. Humans. 

